Refreshing the asp.net web page after validation - c#

I have an asp.net web page (C# 2008) where the user would enter an EmployeeID, and when they tab out of the textbox (the page executes a validation code block in the codebehind), they get a messagebox prompting them to select one of two values from a dropdown listbox.
The code for the message prompt in the codebehind is :
Response.Write("<script>window.alert('Please select Alpha or Beta')</script>");
After the prompt is displayed, and the user clicks "ok" and returns to the page, the text on the page appears distorted (the text in labels are a size larger, the labels get wrapped to another line etc)
I tried putting a Response.Redirect("UserProfileMaint.aspx"); after the messagebox in the codebehind, but now, the messagebox does not appear;
So this is my squence:
User enters EmployeeID
If user has NOT selected Alpha or
Beta, then show messagebox
If user HAS selected Alpha or Beta,
then don't show messagebox
I want to display the messagebox validation, and ensure the appearance of the text on the page is not distorted. How can I do this?


Response.Write writes directly to the output stream, placing it before <html> which the browser gets very confused by (causing your text issues). What you want to do instead is this:
ClientScript.RegisterStartupScript(GetType(), "alert",
"alert('Please select Alpha or Beta');", true);
ClientScript.RegisterStartupScript includes the script in the page to be run on load rather than put in the response too early. The last argument: true is telling it to wrap that alert in <script> tags, keeping your code-behind cleaner.


The best way to handle this would be to use Javascript and do Client side validation. If you really want to do server side validation then instead of showing a alert by using Response.Write you should use RegisterStartupScript or better show the message using a Label at the top.
HTH


When you call Response.Redirect, that occurs on the server side, whereas you want the redirect to occur on the client side after a choice is made.
To do that, when you write your script with Response.Write (btw, there are much better ways to do this), you would have logic that determined what the user selected, and then based on the selection, either requery them for data, or set the location property of the inherent document object to the url you want to redirect to.

Related

ClientScript.RegisterStartupScript Header Text Change

I am using the ClientScript.registerstartup for a conformation message.when the data get saved,it shows a popup as the data has been saved sucessfully.But in that pop up,in the header it shows my localweb address as "The page at ** /localhost:58562/says** and below this it shows the messgae.But i need to change this header text.Is it possible to do it..??? or any other ways to do so..??
ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('This Department Name already exist')", true);
This the code.
Thanks.
** "

Simply have a modal popup extender control with dummy target control id and call the modalpopup.Show() method where you want to show the alert.
Design the panel with header style and have your own text.

No you can't.
Its a security/anti-phishing feature.
Instead you can make your own version of alert and it will do what you want. A simple modal and override the alert function call.
You can use Jquery to have your own alert boxes or confirm boxes. There are many ways but you can use this one. or this or this
Cheers!!!

AJAX / ASP.Net / C# : Show next content only after validation?

I currently have an ASP.Net Web Form that looks like this:
Each section of this web form is wrapped in its own div so that they could be shown or hidden by changing the CSS display: property to none. My intention is to show each section one at a time, starting with the first one. When the user clicks "Next" the currently visible section will be hidden and the next section will be displayed in its place.
Many of the fields have ASP.Net validation controls attached to them (the "Zip Code" validation error message is displayed in this image as an example).
These validation controls have the runat=server
The whole Web Form is being loaded into a parent div dynamically through AJAX. Each Next button is not of type submit (they are of <input type= "button">).
How can I ensure that all fields in a given section are validated before allowing the user to hit "Next" ?
I am pretty stuck on this so some assistance would be really appreciated!

One option is each DIV you can have Next button and also you can use one ValidationGroup for button and the controls need to be validated inside div. if you set validation group it will validated only same group controls before post back.
Or you can have one Next button and change validation group of that button by using client side script or code behind when click on next button.
changing validation group of button with javascript on client side

confirm message box

I have to show a yes no popup messagebox for a function>
This is what i do for an alert popup>
Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "<script>alert('File Updated');</script>");
This is what i want to do in the code behind:
if (ID != 0)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "Confirm", "<script>confirm('are you sure?');</script>");
if (yes)
{
perform function
}
else
{
return;
}
}
The confirm is not working,,, any suggestions on how to do this
thanks
Edit Portion:
Navigate to a page
Add values to a textbox
Click "Save" Button to add value to database
Ask the user if he is sure he want to do it 'are you sure'?,, the confirm pop up
Now the above confirm box will only happen if the ID is != 0 or else there is no need for a popup.
if he says yes then add to database and show alert popup that values have been enterd in the DB.
if NO then just dont add to Db and just return.
so i get the confirm box like this.. but how can i get what is selected
string scriptString = "<script language='JavaScript'> ";
scriptString += "confirm ('Are you sure you want to Close this period.')";
scriptString += "</script>";
Response.Write(scriptString);

Is there a button you are clicking on to trigger the action? If so, you should add the client events to your web control like so:
<asp:ImageButton runat="server" ID="DeleteUrlImageButton" ImageUrl="~/Images/icon_remove.gif"
OnClick="DeleteUrlImageButton_Clicked"
OnClientClick="return confirm('Are you sure you want to delete?');" />
If the user selects yes, the postback happens as usual. If they select no, the even is cancelled and no postback occurs. This, IMO, is the way to handle it because it prevents any extra server activity if they select no.

Add a linkbutton.
In the OnClientClick add
javascript:return confirm('Are you sure')
This will not launch the postback if they click no. It will launch the postback if they click yes.
Then in then code behind (OnClick) of the button do your server side processing:
(Will only be executed if they click yes)
if (ID != 0)
{
Perform function
}

See the problem here is that, without posting back, you can't get the value of the confirm box. JavaScript is run client-side and until a postback occurs (either via ajax or the regular way), it can't "talk" to your C# file.
What you'll have to do is add a confirm box in JavaScript which, if Yes is clicked, will post back to your Asp.net page and run code either through Ajax or (example) form.submit().

It appears that what you're trying to do is (in a simplified scenario):
Have the user navigate to Page.aspx
Check the value of ID (lets assume
it's a querystring parameter)
If the value of ID is non-zero, prompt
the user to confirm
If they confirm do "something"
The mistake you're making is attempting to handle 2, 3 and 4 alltogether in the code-behind. The script that you emit (by calling RegisterStartupScript) doesn't get executed until the entire page has been rendered back to the user, at which point the code for steps 3 and 4 to check the value of ID and do something will already have been "skipped over"
What you need to do is decide how to separate the work between client-site and server-side as what you're attempting to do just won't work. Without knowing how your page(s) work and where the ID value comes from I can't give a speciic example, but, something like:
Have your page check ID to see if it hits your criteria, if it does, emit the javascript, but with some additional javascript that checks the response to the prompt and causes the page to re-submit but with confirmed=yes added on the querystring
Have your page check the querystring parameter "confirmed" to see if it's yes. If it is, THEN do the work

You can't do it this way. RegisterStartupScript just registers the script to be included when the page is finally rendered. After it is rendered (to HTML) then the html is sent to the browser. So when the user finally sees that popup, your code has long since finished.
EDIT:
See the answer by Mike C.: you need to move that confirm to just before the submit.

Page.ClientScript.RegisterStartupScript will register that script on the client. As far as I can see you are executing the if statement on the server. Could you please specify what confirm is not working mean? Is the alert box displaying but no effect should yes/no is pressed? If so, move the if ... else statement on the client. Anyway, I suggest that you replace RegisterStartupScriptBlock with this code:
ClientScript.RegisterClientScriptBlock
(this.GetType(), "confirm", "alert('do')", true);

Issues with displaying messagebox in asp.net

I have the following message box in c# on my asp.net page inside the btnSubmit_Click event.
It tends to popup sometimes and not popup sometimes. Any reasons as to why it is not consistent?
ClientScript.RegisterStartupScript(
GetType(),
"alert",
"alert('An email has been sent to Customer Service');",
true);

I guess that this will depend on the text you are putting inside the alert. In the example you provided the text is hardcoded but I suppose that in your real application this text is dynamic and might contain characters that break javascript such as '. Try using FireBug to see if there are some javascript errors when it doesn't work.

Have You checked, if the alert('An email has been sent to Customer Service'); line is in the HTML Source after you clicked the Button and the message did NOT appear?
If it isn't in the HTML, check:
with the Debugger if your
codeblock is hit
are you maybe redirecting the response?

try these popups instead
type java directly in the visualstudio GUI
On a button go to the "OnClientClick" property (its not into events*) over there type:
return confirm('are you sure?')
it will put a dialog with cancel ok buttons transparent over current page if cancel is pressed no postback will ocure. However if you want only ok button type:
alert ('i told you so')
The events like onclick work server side they execute your code, while OnClientClick runs in the browser side. the come most close to a basic dialog
as this codes is so small it should work unless they have really strange browser clients

How do I insert text into a textbox after popping up another window to request information?

I have an asp.net web page written in C#.
Using some javascript I popup another .aspx page which has a few controls that are filled in and from which I create a small snippet of text.
When the user clicks OK on that dialog box I want to insert that piece of text into a textbox on the page that initial "popped up" the dialog/popup page.
I'm guessing that this will involve javascript which is not a strong point of mine.
How do I do this?

You will have to do something like:
parent.opener.document.getElemenyById('ParentTextBox').value = "New Text";

What you could do is create an ajax modal pop-up instead of a new window. The semantic and aesthetic value is greater not to mention the data-passing is much easier.
http://www.asp.net/ajax/ajaxcontroltoolkit/samples/modalpopup/modalpopup.aspx

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